Problem with XYZ point data and kriging

Rhienne

Posted 16 November 2011 - 11:21 AM

I used to use ArcGIS frequently, but haven't had occasion to use it in several years, and I'm finding I've forgotton large chunks of what I once knew how to do!

I was wondering if anyone would be able to help me with a problem I'm having. I have collected some dGPS data and am trying to create 3D surfaces from it using ArcGIS. I have vague memories of how to do this, but I think I must have done something wrong or forgotten something as the methods I am using don't seem to be working for me.

I converted the data from Excel to txt, and used this to create a 3D shapefile using the XYZ data. This displays fine in ArcScene although I seem to have some vertical exagerration from somewhere. I've then used kriging as my interpolation method using the shapefile. My issue is that while this gives me a surface with colour differentiation depending on Z values, it is completely flat, and I don't understand why this is the case when my shapefile contains xyz data and displays correctly as a 3d image.

J Wallace

Posted 16 November 2011 - 12:17 PM

J Wallace

Contributor

Validated Member

11 posts

United States

Hi Rhienne,I have had similar problems dealing with interpolated surfaces - especially those that have relatively little relief. At the risk of stating the obvious, the first step is to make sure that you have the 'Floating on a custom surface' bullet selected under Layer properties - Base heights. If your surface still appears flat you can set a kind of visual exaggeration by entering a number into the 'Factor to convert layer elevation values to scene units' option a little further down in the Layer properties - Base heights dialog box.Hope this helps!

Rhienne

Posted 29 November 2011 - 09:19 AM

Rhienne

Newbie

Validated Member

8 posts

United Kingdom

Hi Rhienne,I have had similar problems dealing with interpolated surfaces - especially those that have relatively little relief. At the risk of stating the obvious, the first step is to make sure that you have the 'Floating on a custom surface' bullet selected under Layer properties - Base heights. If your surface still appears flat you can set a kind of visual exaggeration by entering a number into the 'Factor to convert layer elevation values to scene units' option a little further down in the Layer properties - Base heights dialog box.Hope this helps!

Thanks so much. I had forgotten that I need to set the base heights to match my 3d layer.